Originally posted by Lars Clausen The non-SE version however is limited by the 63V MKT caps.

Does this mean that one could replace the caps of the non SE version with caps of higher voltage rating and get the same power for the non SE modules - or are there any other limitations

The reason I'm asking is that I would like to use some toroids I allredy have rated at ±50 V AC (± 69 V rails) for subwoofer use - and me thinks not me needs the claimed extra quality of the mid and treble.

About the hiss issue, i have not had the time to test out the best way to do this yet, and also i have not had the time to make an instruction for you, so i am not going to expand on that particular issue just yet. Sorry

Thanks Lars.
I have after trying all of your comercial zappulse modules (from v1.0 to 2.2se) and become quite familiar with them. I have had my problems (with the v4p), but now they only play beautiful music. I have posted my system setup in several forums. The version that surprised me the most was infact the versjon zappulse 1.2, where I tried different mosfets. I ended up using the STP19nb20 and the music flowed with ease
Of course the 2.2se is better, but as an early design, the 1.2 impressed me.
Now I am using the 2.2se (with black gate) and some Elna cerafine psu caps. Diode bridges and 1 trannie /channel. In monoblock. Havent got any problems with hum or hiss.
One day I actually tried them with some 94db speakers I have in my basement. Audio Note AN/J (they are being upgraded), and the combination performed quite good actually. I heard some hiss from the
speakers, but it wasn't much. I am using an audio note dac, one ss preamp, and tried a Kora Eclipse valve pre, with good result. I have some problems with a ground loop or something with the valve pre, but the combination is very interesting. The Kora (upgraded with silver cable, mcap silver caps etc.) is like a pre with turbo. Very dynamic and the combination is extremely lifelike. The earlier zappulse modules didn't like the cable-spaggetti that was behind the amp, but the 2.2 is better here.
Btw. I am planning another pre. for my setup, however one of those I have in mind has got quite high output impedance. The zappulse modules have 17 k input impedance. Is there an easy way of making that input impedance higher?

Best Regards bambadoo
Greetings from Norway. It is snowing now, and it is almost weekend.